* {
    margin: 0px;
    padding: 0px;
}

html,
body {
    width: 100%;
    height: 100%;
    background: #4b4b4b;
}

#linkup {
    position: relative;
    margin: 0px auto;
    font-size: 0px;
}

.square {
    position: absolute;
    display: inline-block;
    width: 86px;
    height: 78px;
    cursor: pointer;
    background-color: darkgray;
    background-size: cover;
    box-sizing: border-box;
    border: 1px solid black;
}